A/2019 G2
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	6 Dec 2019	20.7	2.306 AU	1.919 AU	11h00m	+33°37'	100.1°	24.9°	290°
Nearest approach	9 Jan 2020	19.8	2.339 AU	1.462 AU	08h19m	+54°54'	145.4°	13.8°	204°
Today	5 Jul 2025	28.5	15.625 AU	15.287 AU	00h05m	-13°30'	107.6°	3.6°	250°

The interactive orbit chart above shows the comet's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of A/2019 G2 are:

            e (Eccentricity)                : 0.9942560
            q (Perihelion distance)         : 2.3061860
            i (Inclination)                 : 159.25440
            Ω (Longitude of ascending node) : 208.23950
            ω (Argument of perihelion)      : 82.78930
            L (Longitude of perihelion)     : 125.94433
            B (Latitude of perihelion)      : 20.57406
            T (Time of perihelion passage)  : 2458823.93810
            P (Orbital period in years)     : 8044.89

            Epoch                           : 2025 Jul 04
            Reference                       : MPEC 2024-E01

            Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)
        

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. The gray curve indicates the expected brightness if this object is a comet (15.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve indicates the expected lightcurve for an asteroid (H=16.30; G=.15).

The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.

The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-07-05 00:00 UT   00 05 14.3   -13 28 34    15.297   15.620  106.7    3.6   250   28.5 
2025-07-05 22:25 UT   00 05 09.7   -13 30 03    15.287   15.625  107.6    3.6   250   28.5 
2025-07-06 00:00 UT   00 05 09.4   -13 30 09    15.286   15.625  107.7    3.6   250   28.5 
2025-07-07 00:00 UT   00 05 04.2   -13 31 46    15.276   15.631  108.6    3.5   250   28.5 
2025-07-08 00:00 UT   00 04 58.8   -13 33 24    15.266   15.637  109.6    3.5   251   28.5 
2025-07-09 00:00 UT   00 04 53.2   -13 35 03    15.256   15.642  110.5    3.5   251   28.5 
2025-07-10 00:00 UT   00 04 47.3   -13 36 44    15.246   15.648  111.5    3.5   251   28.5 
2025-07-11 00:00 UT   00 04 41.2   -13 38 25    15.237   15.654  112.4    3.4   251   28.5 
2025-07-12 00:00 UT   00 04 34.8   -13 40 08    15.227   15.659  113.4    3.4   252   28.5 
2025-07-13 00:00 UT   00 04 28.2   -13 41 53    15.218   15.665  114.4    3.4   252   28.5 
2025-07-14 00:00 UT   00 04 21.3   -13 43 38    15.208   15.670  115.3    3.4   252   28.5 
2025-07-15 00:00 UT   00 04 14.2   -13 45 25    15.199   15.676  116.3    3.3   252   28.5 

    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.